JioFi 3 do not have any particular data limit. It totally goes with the recharge plan you have opted for.
On purchase of JioFi3 - you shall get Jio sim card absolutely free.
You can get the best performance of JioFi3 up to 10 meters.
Reliance JioFi3 is absolutely one of the best wi-fi routers. You can buy without any hesitation.
JioFi3 comes with removable 2600 mAh battery. From my personal experience I can say that you can use for almost 2 days nonstop.